Radiation question

1. The problem statement, all variables and given/known data
How long does it take the Sun to melt a block of ice at 0 celcius with a flat horizontal area 1.0 m^2 and thickness 1.0 cm ? Assume that the Sun's rays make an angle of 30 with the vertical and that the emissivity of ice is 0.050.

2. Relevant equations

delta [Q] / delta [t] = (1000W/m^2)(emissivity)A(cos theta)

3. The attempt at a solution

delta [Q] / delta [t] = 1000(.05)(cos30)

I know that this does not give me time. I dont know how to manipulate this equation..please help . Thanks!